EP1281010A1 - Cylindre pourvu d'une butee - Google Patents

Cylindre pourvu d'une butee

Info

Publication number
EP1281010A1
EP1281010A1 EP01932393A EP01932393A EP1281010A1 EP 1281010 A1 EP1281010 A1 EP 1281010A1 EP 01932393 A EP01932393 A EP 01932393A EP 01932393 A EP01932393 A EP 01932393A EP 1281010 A1 EP1281010 A1 EP 1281010A1
Authority
EP
European Patent Office
Prior art keywords
cylinder
cylinder chamber
piston rod
chamber
assembly
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP01932393A
Other languages
German (de)
English (en)
Inventor
Bernardus Johannes Maria Olde Heuvel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP1281010A1 publication Critical patent/EP1281010A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F7/00—Vibration-dampers; Shock-absorbers
    • F16F7/08—Vibration-dampers; Shock-absorbers with friction surfaces rectilinearly movable along each other
    • F16F7/082—Vibration-dampers; Shock-absorbers with friction surfaces rectilinearly movable along each other and characterised by damping force adjustment means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/56—Means for adjusting the length of, or for locking, the spring or damper, e.g. at the end of the stroke

Definitions

  • the present invention relates to a cylinder for manipulating a load, comprising:
  • cylinder housing with a cylinder chamber therein; - an assembly, movable in the cylinder chamber, of a piston in the cylinder chamber and a piston rod connected to the piston and extending outside the cylinder chamber, wherein the cylinder has a substantially non-linear force characteristic and the load has a force characteristic substantially differing herefrom.
  • Such cylinders are known and common, wherein use is for instance made of friction elements.
  • Gas springs are for instance known wherein the sealing of the cylinder chamber round the piston rod exerts extra friction force on the friction rod so as to prevent the force applied by the load being able to cause displacement of the assembly in the cylinder chamber at undesired moments.
  • a situation can be envisaged where a blocking is de-activated and it is not desired that the gas spring compresses immediately herein under the action of the load, but remains in position.
  • a cylinder with such a configuration has the drawback that a constant friction force is applied in the whole operating range of the force characteristics, so that a balancing occurs only at determined points in this operating range. At other points in the operating range of the force characteristics however, the difference is on the contrary magnified so much that operation is hampered.
  • a gas spring can be envisaged which forms for instance the height adjustment for a chair. In order to then set the chair lower - to compress the gas spring - the resistance added with the friction element often has to be overcome again by a user, which then involves great forces which the user must exert . Convenience of operation is therefore low.
  • the present invention has for its object to obviate the drawbacks of the above described known art, for which purpose a cylinder is provided which is distinguished from the known cylinders by a variable force balancing which acts substantially on the cylinder housing and the assembly and which variably balances the difference between the forces associated with the load and with the cylinder.
  • the cylinder comprises a blocking acting on the assembly and the cylinder housing, whereby the assembly can be fixed in a position occupied thereby relative to the cylinder chamber.
  • a blocking can be separate from the force balancing but both provisions can alternatively form a unit .
  • the force balancing can be or comprise a continuously adjustable clamping member which can be designed as a clamping sleeve.
  • a clamping sleeve provides precisely the desired functionality as described above within the scope of the present invention. In energized state the clamping sleeve fixes the cylinder chamber and the assembly relative to each other and, by decreasing the friction force exerted by the clamping sleeve by progressively de-energizing the clamping sleeve, wherein the friction force produced hereby decreases, the point with a balance between all acting forces is reached automatically, wherein the load can be displaced practically without any difficulty.
  • a cylinder according to the invention is such that, along at least a portion of the length of the piston rod, the clamping sleeve is arranged therearound and is connected to the cylinder housing, and in energized state engages the outer surface of the piston rod over substantially the portion of the length and in at least partly de-energized state releases the assembly for movement relative to the cylinder chamber.
  • the friction force produced by the clamping sleeve is exerted on a large surface area of the piston rod. The necessary resistance forces are thus distributed over the surface of the piston rod, so that no damage to the outer surface of the piston rod can occur. Such damage, when moving through the seal of the cylinder chamber, could cause leakage of fluid under pressure from the interior of the cylinder chamber, which is thus effectively prevented in this embodiment.
  • the clamping member and the associated control are arranged outside the cylinder chamber.
  • the clamping member and the associated control can be arranged in the cylinder chamber if conditions therein allow.
  • a clamping sleeve or such a clamping member is possibly less effective. In such cases the whole will preferably be arranged outside the cylinder chamber.
  • the clamping member can be arranged in the interior of the cylinder chamber.
  • the cylinder housing preferably extends beyond a longitudinal outer end of the cylinder chamber and the clamping sleeve (with the control) is arranged in the part of the cylinder housing extending beyond the longitudinal outer end of the cylinder chamber.
  • the clamping sleeve (with the control) is arranged in the part of the cylinder housing extending beyond the longitudinal outer end of the cylinder chamber.
  • the clamping member is arranged immediately adjacently of a longitudinal outer end of the cylinder chamber through which the piston rod extends.
  • the assembly of the cylinder chamber, clamping member and control herein takes up a minimal amount of space in longitudinal direction of the cylinder when the clamping member and the control are arranged outside the cylinder chamber.
  • the piston still has a maximum freedom of movement in the cylinder chamber.
  • the invention further relates to a force balancing for a cylinder, as is evidently intended and suitable for application in a cylinder according to the invention, for instance comprising an elongate clamping member for arranging along at least a part of a piston rod of the cylinder. Modification of existing cylinders which heretofore have had an inferior or no force balancing is thus possible with such a blocking.
  • the cylinder according to the present invention can, as is immediately apparent and stated above, be a gas spring, but the cylinder can alternatively also be a hydraulic or a pneumatic cylinder. As will be apparent herefrom, the invention has many application possibilities in cylinders in general.
  • fig. 1 shows a partly cut-away perspective view of a cylinder according to the present invention in a blocked state of the assembly of piston and piston rod relative to the cylinder chamber
  • fig. 2 shows a view corresponding with fig. 1 in the released state
  • fig. 3 is a partly cut-away perspective view of an alternative embodiment of a cylinder according to the present invention
  • fig. 4 shows a number of alternative embodiments of cylinders with a force balancing designed as clamping sleeve.
  • a gas spring which comprises a cylinder housing 2 having therein a cylinder chamber 3 and a piston 4 which is arranged in cylinder chamber 3 and on which a piston rod 5 is arranged to form an assembly with piston 4.
  • Piston rod 5 protrudes through a ring 6 forming a longitudinal outer end of cylinder chamber 3, wherein a seal 7 is arranged between ring 6 and piston rod 5 in order to maintain the pressure in the interior of cylinder chamber 3 without leakage between ring 6 and piston rod 5.
  • Cylinder 1 further comprises a force balancing
  • the force balancing 8 comprises a clamping sleeve 10 which extends between two rings 11 while forming an elongate clamping member, which rings 11 are pushed apart by the action of a spring 12 which is arranged therebetween and which extends round clamping sleeve 10.
  • the lower ring 11 in fig. 1 is fixed to cylinder housing 2, while the upper ring 11 in fig. 1 can be moved up and down in the direction of double arrow A. Under the influence of spring 12 the upper ring 11 in fig. 1 is thus pushed upward.
  • Clamping sleeve 10, which forms the clamping member is herein stretched in longitudinal direction and tensioned round the outer surface of piston rod 5.
  • the control 9 comprises a tilting arm 13 on a hinge 14. Arranged on tilting arm 13 is a stop 15 which lies against the upper ring 11 in fig. 1, and further a handle 16 which can be grasped by a user from outside cylinder housing 2 for selective control of the force balancing 8.
  • stops 15 are preferably arranged than the single stop shown in fig. 1, 2. Such stops, for instance two, can then be arranged on either side of the ring.
  • the connecting line between the stops preferably then lies transversely of the tilting direction of tilting arm 13 and transversely of the length direction of piston rod 5.
  • Clamping sleeve 10 is made shorter by engaging and moving downward the handle 16 in fig. 1, as shown in fig. 2 with arrow B, wherein the upper ring 11 in fig. 2 is pressed downward counter to the spring force of spring 12.
  • the resistance produced by force balancing 8 is progressively decreased herein until the point is reached where a balance occurs .
  • piston 4 and piston rod 5 can be displaced in cylinder housing 2 practically without a user having to produce any force.
  • Piston rod 5 is released for movement in cylinder chamber 3, wherein piston 4 can move up and downward.
  • a highly sensitive control of the blocking is herein possible, wherein movements of the piston can be made very gradually.
  • the engagement of the piston rod with the clamping sleeve can be effected in any gradation for optimal control of the movement of piston 4.
  • Fig. 3 shows an alternative embodiment of a cylinder 17 according to the present invention.
  • the same or similar components of figures 1, 2 and 3 are designated with the same reference numerals as those used in fig. 1 and 2. Cylinder 17 differs from the embodiments shown in fig.
  • cylinder 17 of fig. 3 is otherwise the same as that described above for figures 1 and 2.
  • the upper of the rings 11 in fig. 3 is moved downward, whereby clamping sleeve 10 progressively loses contact with the outside of piston rod 5 and piston rod 5 is released for movement relative to cylinder chamber 3.
  • the upper of the rings 11 in fig. 3 is pressed upward again under the influence of the spring force of spring 12, and clamping sleeve 10 is hereby stretched once again and tensioned in close-fitting manner round the outer surface of piston rod 5, whereby the piston rod is again fixed relative to piston chamber 3.
  • the blocking is situated in each case in the close vicinity of the longitudinal outer end, space is saved as described above. It is however equally possible for the blocking and the associated control to be situated at a greater distance from the longitudinal outer end of the cylinder chamber through which the piston rod is placed, and so on.
  • the clamping sleeve or a similar measure not to engage the piston rod, but an element connected thereto, such as a coupling rod 18 or a telescopic member 19 as shown schematically in fig. 4A and 4B.
  • Fig. 4 shows three such alternative embodiments with a force balancing designed as clamping sleeve.
  • the scope of the present invention is thus limited only by the appended claims and not to the embodiments explicitly described above and shown in the annexed drawing.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Damping Devices (AREA)
  • Actuator (AREA)

Abstract

L'invention concerne un cylindre (1) destiné à la manipulation d'une charge, lequel cylindre comprend : un logement (2) renfermant une chambre (3) cylindrique ; un ensemble, mobile à l'intérieur de la chambre cylindrique, constitué d'un piston (4) situé dans la chambre cylindrique et d'une tige (5) de piston reliée au piston et s'étendant au-delà de la chambre cylindrique, ledit cylindre ayant une caractéristique de force sensiblement non linéaire et la charge ayant une caractéristique de force sensiblement différente de la caractéristique précédente ; et un dispositif à force variable agissant sensiblement sur le logement du cylindre et l'ensemble, de manière à équilibrer de façon variable la différence entre les forces associées à la charge et au cylindre.
EP01932393A 2000-05-08 2001-05-08 Cylindre pourvu d'une butee Withdrawn EP1281010A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NL1015132A NL1015132C2 (nl) 2000-05-08 2000-05-08 Cilinder met blokkering.
NL1015132 2000-05-08
PCT/NL2001/000350 WO2001086168A1 (fr) 2000-05-08 2001-05-08 Cylindre pourvu d'une butee

Publications (1)

Publication Number Publication Date
EP1281010A1 true EP1281010A1 (fr) 2003-02-05

Family

ID=19771335

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01932393A Withdrawn EP1281010A1 (fr) 2000-05-08 2001-05-08 Cylindre pourvu d'une butee

Country Status (4)

Country Link
EP (1) EP1281010A1 (fr)
AU (1) AU2001258920A1 (fr)
NL (1) NL1015132C2 (fr)
WO (1) WO2001086168A1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5131115A (en) * 1991-01-28 1992-07-21 J. Sarto Co. Variable position door holder and stop
GB2273545A (en) * 1992-12-15 1994-06-22 Camloc Strut with adjustable friction means
NL1003968C2 (nl) * 1996-09-05 1998-03-06 Bernardus Johannes Mari Heuvel Mechanische bevestigingsconstructie.
NL1006380C2 (nl) * 1997-06-24 1998-12-28 Petrus Antonius Besselink Geleider voor geleiding van bewegingen in twee tegenovergestelde richtingen en diverse inrichtingen voorzien van een dergelijke geleider.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0186168A1 *

Also Published As

Publication number Publication date
NL1015132C2 (nl) 2001-11-13
AU2001258920A1 (en) 2001-11-20
WO2001086168A1 (fr) 2001-11-15

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Legal Events

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Effective date: 20041201